So I thought I fixed this problem and after fixing the mixture and draining some and refilling it with the more coolant the problem came back.

Thermostat is a new 180f Mazdatrix one.

I drained the coolant out from the drain on the bottom of the radiator and refilled it after tightening it back on.

I fixed the problem before by blocking off the overflow nipple on the radiator , taking the pressure cap off that and putting it on the filler neck and putting the flat cap from the filler neck on the radiator.

So am I just going crazy or is there a problem ?

Engine bay setup as shown and temps I'm running are as shown.







Rotary > Pistons

 

temps ok to me.looks like it anyways with a stock s4 gauge.

 

I am just a hyperly over paranoid person.. ask Kevin... its a good thing to be with a rotary though haha.

I just started her up and let her idle awhile and whattaya know the upper hose got pressurized.

At least I pay attention to this stuff!

Rotary > Pistons

 

I am not sure I understand the question/problem.

Pressure in the cooling system (of a healthy engine) is proportional to the temperature of the coolant. The hotter the coolant, the more pressure (and vice versa). If you had a pressure gauge hooked into your coolant system, you would see pressure start at zero and slowly rise as the coolant temps rise, and fall as coolant temps fall. With an engine not fully warmed up sitting there with the hood up idling for a few minutes you won't see a lot of pressure, maybe 5psi. With an engine that is nice and hot after driving around for a few minutes you'll see 10-13psi.

 

I was just going crazy thinking something was wrong because my hoses weren't getting stiff but I'm pretty sure everything's fine.

The hoses got some pressure after I started it and idled it for awhile.

Car runs really good Kevin, good work as always.

Rotary > Pistons

 

Woah!..not getting a stiff hose?
Sorry about your luck!
They have a drug for that you know..

 

I don't have any problems with that haha

Rotary > Pistons